[hpsdr] Pan adapter passband accuracy

[Scott Traurig]

That makes sense, Willi, i.e. that perhaps there was a bandwidth restricted
version distributed outside of the US, but never inside the US as far as I
know.

It has always amazed me that nobody blinks an eye at the AM fanatics who
often take up as much as 40KHz bandwidth, but as soon as an ESSB signal
shows up using 4 or 5KHz it's the end of the world.

Once upon a time AM was attractive because it was the only way to obtain
larger audio passbands. With the advent of ESSB this can now be achieved
with much greater spectral efficiency. And with the proliferation of
spectral displays on radios from all vendors, SDR and otherwise, it is much
easier to find a friendly spot on the band, or know when it is time to be a
good citizen and reduce bandwidth.

73!

Scott/w-u-2-o

On Mon, Apr 13, 2020 at 5:01 PM Willi Reppel <wi.re at telia.com> wrote:

> Hi Scott,
> It is possible that Flex Radio Systems had different versions of programs
> in their library for Europe. I noticed after downloading of a new version
> after 2005
> that certain improvements were made and I could not choose any longer said
> 10 kHz bandwidth and the keying speed was also limited to 30-45 wpm.
> It was great fun to send short music tu-nes in ssb to show the outstanding
> per-formance of the SDR 1000, having in mind that this was illegal in
> Sweden and most other countries in Europe. A FM-type of high reproduction
> quality was confirmed by listeners who were instruc-ted to widen their rx
> bandwidth.
> I´ll try to put my vintage SDR 1000 in operation again and hope to find
> the old program on one of my defunct compu-ters.
> vy 73 es cuagn de
> SM6OMH Willi
>
> ----- Original Message -----
> *From:* Scott Traurig <scott.traurig at gmail.com>
>
> I had a Flex-3000. The PowerSDR software client application provided by
> Flex that ran that and the other legacy series Flex radios allowed a 10KHz
> transmit passband (20KHz on AM).
>
> The SmartSDR software client provided by Flex for the current day Flex
> radios also allows 10KHz (20KHz on AM).
>
> The software clients for openHPSDR architecture hardware, PowerSDR mRX PS
> and Thetis, both allow 10KHz (20KHz on AM).
>
> As far as I know there were no versions of the above applications that
> limited the TX passband to 3KHz.
>
> There are no regulations in the US that set limits on the bandwidth of
> amateur radio phone signals except on 60M.
>
> 73,
>
> Scott/w-u-2-o
>
>
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